Process of recovering zinc from galvanized-iron articles.



EDUARD BROEMEE, GE ST. PETEESBURG, RUSSIA, AND EtUlJCIL-E STELIAU, Q21

NUREMBEBG, GERMANY.

PROCESS OF BECOVERIN'G ZINC FRQM GALVANIZED-IEQN ,QRTZCLES.

accesses.

Ho llrawing.

To allwhom it may concern:

Be it known that We, EDUARD Bromine, a citizen of the Confederation of Switzerland, residing at St. Petersburg, in the Empire of Russia, and Rnoonr Srnmno, a citizen of the German Empire, residing at Nuremherg, Bavaria, in said Empire, have in vented certain new and useful "improvements in Processes of Recovering Zinc from Gal vanized-lron Articles, of which the following is a specification.

The recovery of zinc from galvanized iron scrap, in particular pieces of galvanized sheet, Wires, nails and the like of an average percentage of 643% of zinc by chlorination-roasting with common salt is not only incomplete, but also impractical, as large quantities of iron and manganese are dissolved, which can be removed by an expensive treatment only.

The process known'for recovering the zinc from zinc ore which consists in the finely ground ore being treated either With a solution of sodium hisulfate or in a roasting oven with sodium bisulfate and a small addition of common salt and sulfuric acid cannot be employed for recovering zinc from galvanized iron scrap.

The present invention consists in that the iron scrap from which the zinc is to be recovered is treated in the presence of much Water with quantities equivalent to the Zinc ofamixture of alkali hisulfate and of a chlorid of a metal Whose hydroxidhas an alkaline reaction, such as alkali or earth alkali metals. This treatment may be carried out at ordinary temperature or for accelerating the reaction at boiling temperature or under steam-pressure.

Example: 100 kilos of galvanized iron scrap of 9% zinc is boiled with a solution or" 20 kilos of sodium bisulfate and 20 kilos of common salt, until all zinc has gone into solution. A very pure solution of zinc chlorid, sodium sulfate and sodium chlorid containing traces only of iron and manganese will he obtained, which can he used for the production of lithophone.

By the alkali bisultate and sodium chlorid Specification of Letters Patent.

Patented 531%,

Application filed May 31, 1912. Serial 110. 768,815.

are formed hydrochloric acid, sodium sulfate and hydrogen according to the follow ing equation:

While the metallic zinc and hydrochloric acid form zinc cliloricl and hydrogen aecordmg to the equation:

By the complete removal of the zinc from the galvanized iron scraps re obtained nearly pure zinc-lyes which contain zinc chlorid, sodium sulfate and sodium ohlorid and which when treated with barium sullirl according to the following equation:

can he used directly tor the manufacture of lithopone-White.

Ne claim:

1. The process herein described of re covering zinc from galvanized iron articles, which consists in treating said articles in the presence of an excess of water with a mixture of. alkali bisulfate and alkali chlorid in quantities equivalent to the zinc to be recovered.

2. The process herein described of cring zinc from galvanized iron articles, which consists in treating said articles l) the presence of an excess of water 'Wl mixture of alkali bisulffate and a Clilm C of a metal Whose hydroxid has all oil reaction.

In testimony, that We claim the forearm as our invention, We have signed our o in presence of two suhscrihin witnes EDUARU BROEMA RUD' *LF STElllfl Witnesses as to the signatui oi" Eduard, Broemme:

H, A. Lovmsnmn, AUG. Mrems.

Witnesses as to the signature of Rudolf Steinau:

Oscar: Boon, lxnrii W. Don.

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